1 files changed, 1 insertions, 1 deletions

diff --git a/configure1.in b/configure1.in
index 2cae7c6191c..0bd54698ca0 100755
--- a/configure1.in
+++ b/configure1.in
@@ -1011,7 +1011,7 @@ case "${canonical}" in
       *-isc1.* | *-isc2.[01]* ) opsys=386-ix ;;
       *-isc2.2* )               opsys=isc2-2 ;;
       *-isc* )                  opsys=isc3-0 ;;
-      *-esix5* )                opsys=esix5r4 ;;
+      *-esix5* )                opsys=esix5r4; NON_GNU_CPP=/usr/lib/cpp ;;
       *-esix* )                 opsys=esix ;;
       *-xenix* )                opsys=xenix ;;
       *-linux* )                opsys=linux ;;